<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>文件上传</title>
</head>
<body>
    <form action="/file/upload" method="post" enctype="multipart/form-data">
        用户名：<input type="text" name="username"><br>
        头像：<input type="file" name="file"><br>
        <input type="submit" value="提交">
    </form>
</body>
</html>
